How to map a grid to a sphere
This question has already been answered somewhere but I don't know where, so what you should do is:


Create an icosphere and a small sphere. Give your icosphere a Particle System > Hair. Enable the Advanced option. In Render, enable Object and choose the little sphere as Dupli Object. In Emission give it the number of vertices your icosphere has and choose Emit From > Verts, deactivate Random, set the Hair Length value.





Give your icosphere a Wireframe modifier. Choose the Thickness you want. You'll have to choose an Emission shader as material.